Maize is the most widely grown crop in the Republic of Croatia. The frequent drought phenomena as well the air temperatures above the long term average are the reason for yield reduction. According to data from Agricultural institute in Osijek the irrigation practice is significant for maize yield as well as for yield components and chemical compounds. Amount of irrigation water ranged from 355 (2010) to 245 mm (2012). In average the maize yield ranged from 7.4 to 10.3 t/ha. The irrigation practice decreases the protein content, hectolitre weight (a1 =127 g; a2= 137 g), grain number per cob (A1= 564; A3= 584) and cob weight (A1-210 g, A3-216 g) while the influence of irrigation on cob length was non-significant.